All widgets showing in “customize” view

Hi there,

I am not sure when this change started occurring I am afraid, but as of recently when in the customize (admin view), all my hidden widgets display in the customize view when previously they were hidden if the logic resulted in hiding them when published.

Luckily they are still hidden when viewed as a user (when published) but this has made the customize view difficult to use.

See my annotated screenshot here: https://snipboard.io/yzkcCI.jpg
Please let me know if this is now a setting somewhere or an issue (or if purely a conflict and not intended/new change)